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DAO were originally called VT Objects. DAO 1.0 came up in November 1992. In version 3.5 it was able to bypass the Jet engine altogether and directly access ODBC data sources, including Microsoft SQL Server and other enterprise database systems. DAO 3.6 was the final version developed by Microsoft. Microsoft says that DAO will not be available in its future 64-bitoperating systems.[1]

DAO works by creating a "Workspace" object in which all database operations are performed. The workspace object exists as a session object that exists within a larger database engine object. There are two types of database engines: a Jet database engine object, and an ODBCDirect database engine.